In recent weeks, motorbike enthusiasts around the world have been speculating over when and whether they can get their hands on Chinese bikemaker ZXMOTO’s 820RR.  The curiosity is understandable. In March, the very bike powered to victory at the Superbike World Championship in Portugal by a margin of nearly four seconds, marking the first time that a China-made bike took top honours. No small feat after decades of dominance by European and Japanese superbike makers, such as Ducati, Kawasaki and Yamaha, whose comparable high-performance bikes are priced several times higher than the 820RR’s 40,000 yuan (S$7,470). Overnight, ZXMOTO founder Zhang Xue…